Mechanical shovel



Mar. 3, 1925. 1,527,995

C. PARKS MECHANICAL SHOVEL 2 Sheets-Sheet l Filed May l2, 1

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Mar. 3, 1925.

C. A. PARKS MECHAR GAL: SHOVI'JL Filed May 12, 1924 2 Sheets-Sheet 2Invent o1,

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Patented Mar'. 3, 1925..

UNITED STATES- 1,521,995 PATENT OFFICE.

CHARLES A. rAnKs, or cHIsHoLM, MINNESOTA.

MECHANICAL srrovEL.

Application led May`12, 1924. Serial No. 712,524.

This invention rclatesf to mechanical shovels such as used in miningoperations in tunnels or the like, and refers particularly to that typeof shovel which 'discharges its burden overhead into a car or otherreceptacle at the rear of the shovel.

The principal object is to produce a more practical and efficient deviceof this character than heretofore known. l

Other objects andY advantages will appear in the further description ofthe invention.

Referring now tothe accompanying drawingin which like referencecharacters indicate likeparts:

Figure 1 is a side elevation of one of the improved machines with theshovel proper or dippershown as being locked in vertical position;

Figure 2 is a front elevation of the machine, showing a portion of oneside thereof in section;

Figure 3 is an enlarged sectional view of a fragmental portion of oneside of the machine; and

Figure 4 is a side elevation of the machine showing the dipper indigging position, and in dotted lines the dipper in dischargingposition. The machine is pivotally supported upon aturntable 1, mountedupon a truck 2, as is customary in such devices, and may be operatedpivotally upon the table in any well known manner, the same not formingpart of my present invention; nor does the spe- Iciic arrangement ofpower unit, not shown,

enter into the invention.

Upon the turntable is mounted a frame structure including thehorizontally disposed and verticallyspace'd side beams 3 and 4, therebeing a pair of these upon either side which may be securely united inany manner desired.

A rectangularly shaped superstructure indicat'ed at 5 is supported abovethe frame, and at the rear of the machine is a centrally positionedupright superstructure 6 the principal object of which is to supportoperating mechanism, such as sheaves, rollers, or the like. Within andsubstantially centrally o-f the superstructure is located a double linewinding drum 7, it being mounted upon a suitable shaft 8 and providedwith any desired form of power controlling mechanism not shown.Intermediate of the side members 3 and 4 are a set of carriagesupporting rollers o-r wheels indicated at 9, they being of V-shapecircumferential form so as to fit 9. The shaft 13 carries intermediateof the side beams of the frame a longitudinally tapered roller 14intermediate of the ends of which and the beams 12 are short Hatrolle-rs 15 which simply form spacers between the side beams 12 and theends .of the tapered roller.'v The forward ends of the carriage 12 aresupported by V-shaped rollers 16 mounted upon the protruding ends of thethrough shaft 17, which shaft is fixed within the side beams 4, thusforming a permanent non-frictional support for the reciprocablecarriage. There are V-shaped tonguesor webs 18 on the lower face of thebeams 12 to fit within the correspondingly shaped faces of the rollers16, the same be-v ing to provide against lateral objectionable movementof the carriage, but to permit -of the free reciprocaton thereof.

The shovel proper of the machine is'indicated at 20 and preferably iselongated laterally of the machine to provide the greatest capacitypossible and is so shaped ing end, and as at 23 on the opposite end;these angled ends being designed to overlap the ends of the carriagebeams when brought into contact therewith, and being of suiii- 5cientlength toy provide for variable adjustment of the dipper 2Othereupon. The overlapping engagement of the shovel end of the rockersis for the purpose f providing positive forcing connection with thecarriage l0 for the shovel, as by the action of the carriage the shovelis forced into the matter being shovelled, while the engagement of theopposite angled ends of the rockers is for the purpose of preventingslipping back- 5 wardly of the rockers when the shovel is discharging atthe rear of the machine.

Further securing means for the rockers is provided in the way of a wirerope or line 24 'lying within the suitable channel 50 l25 for thepurpose in the upper face of the carriage beams 12; these ropesor'chains if preferred being securely fastened at one end' Intermittentlocking means is provided 3 lfor the rockers 19 in the form of uprightdogs 27 pivoted at 28 on the sides of the carriage beams 12, the rockershaving a lat-- erally protruding catch 29 just at the junction of thebrace 21 with the rearmost portion of the rocker, and which catch, whenthe rockers are in the position shown in Figure 1, are engaged by thedog,4 the tail of the latter having a contractile spring 30 attachedthereto for the purpose of insuring 5 such engagement automatically whenthe dipper is raised. This intermittent locking device upon either sideof the carrage is essential in that in the event of the carriage beingextended forwardly somewhat and draft is applied to the lifting line of`the f shovel until the same is elevated t0 the position shown in Fig. 1of the drawings, it will automatically become locked in that position,and there 'retained until aV continued draft upon the operating linewill cause the carriage 'to be fully retarded until at leasty the tail31 of the dog engages the end of the laterally projecting pin 32 mountedwithinthe beam 4. It is apparent that the positioning `of the pins 32will determine the duration of locked relation existing between therockers and the carriage beams.

Thus it will be seen that when the shovel' is'fully raised, or at leastto the position shown'in Fig. 1' of the drawings, and the carriage fullyretarded, the locks will be released, and a further stress upon theoperating line will cause the shovel or dipper to continue its travel'tothe rear of the machine and dump; it being pivotally support- 7(` ed atthe extreme junction of the rear end of the rockers 19 over the rearmostend of the carriage beams.

But a single line 33 is used for operating the shovel or dipper, bothends of which are suitably connected as at 34 to the under side ofthedipper. Forwardly of the dipper the line passes over an elongated spoollike roller 35. it being less in diameterfcentrally than at the two endsso as to cause the line to pull centrally as much as possible; thencedownwardly to the similarly shaped roller 14, around it to the back ofthe machine, around a similarly shaped roller upon the same shaft thatsupports the rearmost rollers 9, thence forwardly again to a similarlyshaped roller 36 in the forward end *of the superstructure. thenceupwardly to the snatch block 37 and fromthere to the left side of thedrum 7 as viewed from the front of the machine.

The snatch block 37 is yieldably supported by a line 38 hanging over theroller 35 and having a suitable weight 39 attached thereto, thesamebeing -to compensate for any undue slack occurring in the operatingline.

While l have stated that but a single line y is used two short ones maybe employed in preference thereto butthe action is the same as a singleline for the opposite end is wound in the opposite way around the righthand end or section of the drum 7 so that when one end is wound up theother is unwound and^this end of the line leads from the dipper 20 toand around the small tapered roller,40 mounted in the central uprightframe 6. thence directly to and around the right section of the drum, asclearly shown in Figure 2. 110

Just inside of each pair of side members 3 and 4 and mounted upon theshafts 11 are fixed the beams 41, which. as is evident, travel back andforth with the carriage. DirectlyV over` these beams is mounted atransverse shaft 42 rockably controlled by the lever 43 which is placed`conveniently for the operator, and this shaft carries' eccentrics 44directly over the beams 41 and engageable therewith when the shaft 42 issuitably rocked or rotated for such purpose. This is to act as a brakeor holding means for the carriage so that in the event of wishing tohold the dipper up against the work the carriage may be held stationarywhile the dipper is raised to the desired position when the carriage maybe released to act in conjunctionwith the positioning of the dipper asheretofore described.

The operation of the device is as follows: 130

is desired to Aoperate same'as a shovel, thel drum 7 is rotated inclockwise direction, which will causel stress toy be put on the lineleading tothe forward end of the machine and slacken the line leading`to the rear when the dipper will vbe drawn in an arcuate coursedownwardly in front of the forward end of the carriage, the rockers 19rolling upon and traversing the upper surface of the beams 12, lwhichmot-ionit is obvious will automatically unlock the dogs27, ity

being impossible for them to function as a lock during such motion ofthe rockers. The y shovel will then assume a position of rest if desiredwith the straight portion of the rockers lying upon the forward portionof the carriage beams l2 when a continued stress upon said line willcause the carriage to .ad` vance due to the fact that the pullingvlinepasses around the extreme rearmost roller on ythe axle 11 of thecarriage.- Thus the shovel may be forced into the muck or face of thematerial beingengaged. Then when desired to lift same up and over themachine fordumping the drum 7 is ,turned in anti-clockwise directionwhen stress is put upon the opposite end of the line, and the lirsttendency is for the carriage to recede until that point is reached whenthe dipper will be raised more readily than the backing up of thecarriage, or, -as before stated, the

carriage may beheld at any`desired point by the frictioneccentrics 44being applied thereto. In either event the dipper will eventually riseto the position shown in the drawing, Figure 1, when the dogs 27 willfunction to hold the dipper in such relation to thev carriage until-atleast the latter has become 'suciently retracted forthe tail of the dogsto engage the pins22'which releases their hold upon the dipper rockers,when the dipper may be further drawn backward ly into dumping position.

It is evident that I have shown but a sin: gle embodiment of theinvention, the details of which may be considerably varied withf outdeparting from the sp-iritof the invention.

Having thus described my'invention, what `v I claim and desire to ent,is:

l. A mechanical shovel of the type described comprising an upright framestructure, a'horizontally reciprocable carriage in the base of thestructure, va dipper, rocker arms rigidly attached to the dipperwhollysupported and rockably carried upon the secure by Letters Patcarriage,and means for operating said arms.

2.- A mechanical shovel of the type described comprising an upright'frame structure, a horizontally reciprocable carriage in the base ofthe structure, a dipper, rocker arms rigidly attached to the dipper androckably carried upon the` carriage, and a single line` and drum forselectively orsimultaneously operating the carriage and dipper.

3. A mechanical shovel ofthe type describedv comprising an upright framestructure, a horizontally reciprocable carriage in the base of thestructure, a dipper, rocker arms rigidly attached to the dipper androckably carried upon the carriage, a single line and drum forselectively and simultaneously voperating the carriage and dipper, andcooperative means upon the carriage and arms for automatically lockingsaid arms to the carriage when the dipper is in ously operating thecarriage and dipper, co-

.operativeimeans upon the carriage and arms for automatically lockingsaid arms to the carriage when the dipper is in its extreme.

uppermost position and means for4 automatically releasing said lockingengagement for discharging the contents of the dipper.

In testimony whereof I hereunto afIiX my signature in the presenceof-two witnesses.

i CHARLES A. PARKS. Witnesses: i JOHN FRANK MCDONALD,

FRANK R. ZIMMERMAN.

